I was typing when you posted, read above. If each of the 4 motors does that then you have a ground or fuse that is intermittent. Grounds need cleaned, shined, tightened or bypassed with a test ground. You are not lost, I am helping you, read and do. How many wires to each motor? what color? Do you know if the seat motors work with the switches without memory hooked up. I don't know that much about memory seats but maybe they are waiting for a memory signal. If the switches are a separate manual over-ride then you can proceed.
